Display panel, preparation method thereof, and display device

Abstract

Disclosed in embodiments of the present disclosure are a display panel, a preparation method thereof, and a display device. A display panel having a display area and a non-display area includes: a base substrate; an auxiliary electrode in the non-display area; a passivation layer disposed on a side of the auxiliary electrode facing away from the base substrate, having a first opening in the non-display area, in the first opening, an accommodating space is formed between the passivation layer and the auxiliary electrode, the accommodating space exposes part of the auxiliary electrode; an orthographic projection of the passivation layer on the base substrate covers an orthographic projection of the accommodating space on the base substrate; a cathode layer disposed on a side of the passivation layer facing away from the base substrate, having a connecting portion in the accommodating space, the connecting portion being connected to the auxiliary electrode.

What is claimed is: 
     
       1. A method for preparing a display panel, wherein the display panel is provided with a display area and a non-display area surrounding the display area;
 wherein the display panel comprises: a base substrate; an auxiliary electrode disposed on the base substrate and in the non-display area, a passivation layer disposed on a side, facing away from the base substrate, of the auxiliary electrode, and provided with a first opening in the non-display area, wherein in the first opening, an accommodating space is formed between the passivation layer and the auxiliary electrode, the accommodating space exposes at least part of the auxiliary electrode; and an orthographic projection of the passivation layer on the base substrate covers an orthographic projection of the accommodating space on the base substrate; and a cathode layer disposed on a side, facing away from the base substrate, of the passivation layer, and provided with a connecting portion in the accommodating space, the connecting portion being electrically connected to the auxiliary electrode; 
 wherein the method comprises: 
 successively forming a pattern of the auxiliary electrode and a pattern of the passivation layer over the base substrate; 
 applying a voltage to the auxiliary electrode; and 
 evaporating a cathode material on the passivation layer; 
 wherein the cathode material carries charges that are electrically opposite to the voltage applied to the auxiliary electrode, and the cathode material, when being evaporated, is attracted to the accommodating space by the auxiliary electrode. 
 
     
     
       2. The method according to  claim 1 , wherein in the first opening, the passivation layer is provided with a first notch, and the accommodating space comprises the first notch. 
     
     
       3. The method according to  claim 1 , wherein in the first opening, the auxiliary electrode is provided with a second notch, and the accommodating space comprises the second notch. 
     
     
       4. The method according to  claim 3 , wherein the auxiliary electrode comprises a first metal layer and a second metal layer stacked successively, the second metal layer is partially shortened with respect to the first metal layer to form the second notch. 
     
     
       5. The method according to  claim 4 , wherein an orthographic projection of the first metal layer on the base substrate covers the orthographic projection of the accommodating space on the base substrate. 
     
     
       6. The display panel according to  claim 1 , wherein the display panel further comprises:
 a planarization layer disposed between the passivation layer and the cathode layer, and provided with a second opening; an orthographic projection of the second opening on the base substrate covering an orthographic projection of the first opening on the base substrate; and 
 a pixel defining layer disposed between the planarization layer and the cathode layer, and provided with a third opening; an orthographic projection of the third opening on the base substrate covering the orthographic projection of the first opening on the base substrate; 
 wherein edges of the first opening, the second opening and the third opening rise stepwise. 
 
     
     
       7. The method according to  claim 6 , wherein the orthographic projection of the second opening on the base substrate covers the orthographic projection of the accommodating space on the base substrate. 
     
     
       8. The method according to  claim 6 , wherein the display panel further comprises:
 an organic functional layer disposed between the pixel defining layer and the cathode layer; 
 wherein in the first opening, the organic functional layer is broken at the accommodating space. 
 
     
     
       9. The method according to  claim 1 , wherein the display panel further comprises:
 source-drain electrodes in the display area of the base substrate; 
 wherein the auxiliary electrode is prepared in a same layer as the source-drain electrodes. 
 
     
     
       10. The method according to  claim 1 , wherein the auxiliary electrode is an annular electrode surrounding the display area, and the first opening is an annular opening surrounding the display area.